I love Gankutsuou, and it's often my recommendation of choice, but other than me bringing it up in that context, I don't see it posted about.

For the most part, what I see posted about are recent season anime. Only a handful of older shows get discussed.

And the only one of the rest of your list that I've heard of is Black Rock Shooter. Which isn't that surprising considering this is a "that you've rarely seen-someone-posting about" thread.

Well i put up Black Rock Shooter, cause I thought it was underappreciated, comparing with the other 2012 shows, that and it is one of my favorites. Same can be said for Tegami Bachi and Nurarihyon No Mago, I just think these 2 shows are over-shadowed especially from the shonen genre, and again, there are my personal favorites.As for older shows, I still think Gankutsuou is a underrated masterpiece that i can recommend to just about everyone(and its currently my 4th favorite anime) Other shows i would include are Blood+,Eden Of The East,Kaiba etc, basically any underrated show I have seen.